Assighos to stewart-washer



May 4 1926.

C. S. BURTON OIL GUN Fild Jan. 4. 1923 W FOR/1&7? 5 a May 4, 1926.

BURTON, OF OAK PARK, ILLINOIS, ASSIGNOR TO STENART'WAR-NER "PEEDOMETER CORPORATION, OF CHICAGO, ILLINOIS, A CORPORATION OI VIR- CHAR-BBQ El.

tl-INIA.

Application filed January To all who/2t it may concern:

lie it known that l, (hurries S. BURTON, a citizen or the United States, residing in the vi llagc of Oak Park, in the county of Cool; and the State of Illinois, have invented certain new and in tul liniprovements in Oil (lune, oi? which the il ollowing is a spcciticw tiou, reference being had to the accompany ing drawings, forming part thereof.

The purpose of this invention is to provide a lubricant injecting device of the type coumionly called an oil gun which shall be oi? simple construction and obvious mode of operation for forcing lubricant into the bearings of a mechanism such as an automobile. It consists in the elements and features of construction shown and described as indicated in the claim.

in the drawings Figure 1 is an axial section of a device embodying this invention with the piston member at withdrawn position.

Figure 2 is a detail section at the line 2-2 on Figure 1.

Figure 3 is an axial section of the device with the piston at iii-thrust position.

Figure 4t is a detail inverted plan View of a valve cage for retaining a check valve in the piston.

The construction shown in the drawing comprises a cylindrical reservoir, 1, for holding the lubricant having a diametrically reduced end portion, 4, constituting a pump cylinder whose discharge end is fitted with a nozzle member, 2%, conically tapered toward its extremity and having its discharge aperture, 25, conically counterbored as shown at 13; the purpose of the conical formation exteriorly and interiorly being to adapt the nozzle to either enter and center itseli in the oil inlet port of the bearing to be lubricated, or to center itself on the oil nipple which sometimes is provided at the oil inlet. The nozzle, 15, is counterbored at 26 back of its discharge port to form chamber for the spring, 16, and back of said spring chamber it is further counterbored at 2l'and interiorly threaded for screwing onto the end of the pump cylinder, 4. Said pump cylinder, 4, has its lower end inwardly flanged as seen at 15 to afford a seat for the checlr valve, ll, yieldingly held against that seat by the spring, 16, in the chamber, 26. Mounted axially with respect to the reser- 1) mp cylinder, 1.

l,582,il6tl FATE? GFFICE.

OIL GUN.

serial No. 010,

voir, 1, and pump cylinder, at, is a plunger, 28, whose lower end portion, 5, constitutes the pump piston being diametered to fit pistonwise in the pump cylinder member, l. Conveniently the plunger, 28, is of the same diameter throughout its length and at its upper end it extends out through the cap, 2, and guide bearing disk, 3, which close the upper end or the reservoir, 1, and above the reservoir it is provided with a knob, 6, to serve as an operating handle suitably shaped for conveniently applying maximum manual pressure to drive the piston down into the 7 is a stop collar on the plunger, 28, for limiting the rip-thrust or withdrawal movement. The lower portion, 5, of the plunger constituting the pump piston is axially bored at 8 from the lower end to a point which at the iii-thrust position oi the piston shown in Figure 3 is just above the portion of reduced diameter which constitutes the pump cylinder as seen in Figure 3. And at this point, that is the upper end of the bore, 8, the piston is crossbored as shown at 9 to connect the axial bore outwardly with the chamber of the reservoir, 1. At the lower end of the axial bore, 8, of the piston member it is slightly counterbored to receive the valve cage, 21, which is flanged at its upper end as seen at 29 to atl'ord a downwardly facing seat for the check valve, 10, which is retained in the cage by the lugs, 22, at the lower end of the cage flexed inwardly after the ball is inserted seen in Figure 4;.

The cap, 2, carrying the guide bearing disk, 3, is interiorly threaded for screwing into the upper end of the reservoir, 1, and adapted to be unscrewed and withdrawn for filling the reservoir.

Upon considering the above described structure it will be understood that the reservoir, 1, being filled with lubricant, the pis ton being at the time withdrawn to any convenient distance to permit the withdrawal of the cap surliciently for obtaining access to the reservoir for filling it, and the cap having been replaced, the depression of the plunger to the limit of its stroke in the cylinder, 4, will eject the air, it any, or the lubricai'it, if any, contained in the cylinder, 4, prior to the filling operation; and that upon the retraction of the plunger the valve, 14:, being seated and closing the inlet, a vacuum will be produced in the cylinder, l, below the withdrawing piston which will cause lubricant to be forced in through the cross ports, 9, and axial bore, 8, forcing out past the valve, 10, any air or lubricant which may have been in the said bore at the beginning of the operation, so that at the end of the retracting movement of the piston its bore and the space below it in the cylinder, 4, will be occupied with lubricant. Then upon the next inthrust of the plunger the piston entering and traversing the cylinder, 4, will force out the lubricant past the valve, 14, the valve, 10, in the end of the piston being in this movement seated upwardly so that the lubricant is not forcet back into and through the bore of the piston. And it will be understood that by reason of thesmall diameter of the bore of the piston, 5, and of the bore of the cylinder, 4, very effective pressure can be produced by hand for driving the lubricant forceably into the beaings or oil circulatory system of the machine to be served by the device.

It will be further noted that at the ex;- treme retracted position of the piston shown in Figure 1, its lower end is above the upper end of the restricted bore of the cylinder, 4. A purpose of this feature of construction is that if under any circumstances, such as clogging of the ports, 9, or bore, 8, of the pirton, or jamming ofthe valve, 10, in its seat, the entrance of lubricant through the ports, 9, and down to the bore, 8, and past the valve, 10, in the-retracting movement of the piston should be prevented or should occur deficient1y,to the extent that the lubricant fails to enter by the course indicated into the bore ofthe cylinder, 4, in the retracting movement of the piston, to which extent there will be produced by the retracting movement of the piston a partial vacuum in the bore of the cylinder, 4; and as seen as the end of the piston has passed above the bore of the cylinder, which it fits closely, into the portion of larger diameter immediately thereabove, the lubricant in the chamber will be forced down into the cylinder bore to fill the vacuum created therein; and thus the cylinder will be filled ready for discharge of lubricant upon the next inthrust of the plunger as it is designed to be filled through the ports, 9, and bore, 8, when this passage is unobstructed.

I claim A lubricant injector comprising a lubricant-holding barrel having a head at one end and at its discharge end a reauced portion of relatively small cross-section, a plunger extending axially through the barrel emerging through the head thereof for manual operation and at the inner end adapted to be thrust into the reduced portion fitting the same piston-wise for ejecting the lubricant, a discharge nozzle at the end of the reduced portion and an inwardly seating check valve in said nozzle adapted to open under the discharge pressure; the plunger having an axial bore and a port opening therefrom into the barrel back of the reduced terminal. portion thereof when the plunger is at inthrust position, and a valve in the axial bore seating in a direction opposite to the inthrust lubricant-discharging movement of he plunger.

In testimony whereof I have hereunto setmy hand at Chicago, Illinois, this 2nd day of January, 1923.

CHARLES S. BURTON. 

